7.(33)+15-8=120/38.1/18+1/24+1/30=47/360,360/47=7余31,31-20=11,11/15=44/60,所以7小时44分9.2005除4余1,在a线上 选A10.1992/24=83,84+11*2=106.10.(x+y)=30,(x-y)*5=30*3,x=24,y=6,y/2=3.11.设总为a, (a-x)/2=x,(a-y)/3=y,(a-z)/4=z,x+y+z=a-169.a=78012.13.(3/4+4/5):(1/4+1/5)=31:9 选A"
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